The book "Diary" by Stefan Lefving is an exciting thriller that takes the reader into the intriguing world of the famous Finnish writer Karl Idlund. The main character finds an old diary that belonged to his old friend, a mysterious musician. What is hidden in these records? What was imbued with the mysterious biography of the musician? Each page will reveal a new puzzle of the story, forcing the reader to experience incredible adventures and solve puzzles together with the characters. "Diary" is a story about the treasures of the past, fate and lost dreams, which fascinates and keeps you in suspense until the last page.